Calculate dsrs for local authorities

## # A tibble: 6 x 10
## # Groups:   areaName, date [6]
##   areaName date       total_count total_pop value lowercl uppercl confidence
##   <chr>    <date>           <int>     <dbl> <dbl>   <dbl>   <dbl> <chr>     
## 1 York     2020-11-19         288    210618  137.   122.     155. 95%       
## 2 York     2020-11-20         276    210618  131.   116.     148. 95%       
## 3 York     2020-11-21         277    210618  133.   117.     150. 95%       
## 4 York     2020-11-22         265    210618  126.   111.     143. 95%       
## 5 York     2020-11-23         244    210618  116.   102.     132. 95%       
## 6 York     2020-11-24         224    210618  105.    91.6    120. 95%       
## # … with 2 more variables: statistic <chr>, method <chr>

Get tiers

## # A tibble: 320 x 3
##    local_authority_district_apr… local_authority_district_apr… local_covid_19_t…
##    <chr>                         <chr>                         <chr>            
##  1 E06000001                     Hartlepool                    Tier 3           
##  2 E06000002                     Middlesbrough                 Tier 3           
##  3 E06000003                     Redcar and Cleveland          Tier 3           
##  4 E06000004                     Stockton-on-Tees              Tier 3           
##  5 E06000005                     Darlington                    Tier 3           
##  6 E06000006                     Halton                        Tier 2           
##  7 E06000007                     Warrington                    Tier 2           
##  8 E06000008                     Blackburn with Darwen         Tier 3           
##  9 E06000009                     Blackpool                     Tier 3           
## 10 E06000010                     Kingston upon Hull, City of   Tier 3           
## # … with 310 more rows

DSRs